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Common Fault Analysis and Solution of Fiber Optic Transceiver

Fiber optic transceivers, also known as photoelectric converters, are Ethernet transmission media conversion units that exchange short-distance twisted-pair electrical signals and long-distance optical signals.

Ⅰ. Common faults and solutions of fiber optic transceivers

We will summarize and explain them one by one in a question-and-answer format based on daily maintenance and user problems, hoping to bring some help to the maintenance staff, so as to determine the cause of the fault according to the phenomenon, find the fault point, and "suit the remedy to the case".

1. When connecting the RJ45 port of the transceiver with other devices, what kind of connection is used?

When connect the RJ45 port of the transceiver to the PC network card (DTE data terminal equipment), use a cross twisted pair cable. When connected to the HUB or SWITCH (DCE data communication equipment), use a parallel twisted pair cable.

2. What is the reason why the TxLink light of the fiber optic transceiver is not on?

Connect the twisted pair wrongly; poor contact between the crystal head of twisted pair and the device, or the quality of the twisted pair itself has a problem; the device is not properly connected.

3. What causes the light to be on instead of flashing after the optical fiber is connected normally?

This fault is generally caused by the long transmission distance; the compatibility problem with the network card (connecting with the PC).

4. What should we do if the lights are all on or the indicator is normal but the fiber cannot transmit?

Generally, turn off the power of the fiber optic transceiver, and restart it to return to normal.

5. What is the ambient temperature of the transceiver?

The optical fiber module is greatly affected by the ambient temperature. Although it has a built-in automatic gain circuit, after the temperature exceeds a certain range, the transmitted optical power of the optical module will be affected and decreased.

As a result, the quality of the optical network signal is weakened, the packet loss rate is increased, and the optical link will even be disconnected; (generally, the operating temperature of the optical fiber module can reach 70 °C).

6. What is the function of the link alarm provided on the fiber optic transceiver?

The transceiver has a link alarm function (linkloss). When a fiber is dropped, it will automatically feed back to the electrical port (that is, the indicator light on the electrical port will also go off). If the switch has a network management, it will immediately reflect to the net manager software of the switch.

Ⅱ. Matters needing attention in fiber optic transceivers

1. Does the fiber optic transceiver itself support full duplex and half duplex?

Some chips on the market can only use full-duplex environment at present, and cannot support half-duplex. If it is connected to another brand’s switch (SWITCH) or hub (HUB), and uses half-duplex mode, it will definitely cause serious conflicts and packet loss.

2. Have you done a connection test with other fiber optic transceivers?

At present, there are more and more fiber optic transceivers on the market. If the compatibility of transceivers of different brands has not been tested beforehand, there will also be packet loss, long transmission time, and transmission speed will go up and down.

3. Is there a safety device to prevent packet loss?

When manufacturing fiber optic transceivers, some fiber optic transceiver manufacturers often use the register data transmission mode in order to reduce costs. The biggest disadvantage of this method is the instability and packet loss during transmission, while the best way is to use the buffer circuit design, which can safely avoid data packet loss.

4. Temperature adaptability?

When using the fiber optic transceiver, the transceiver itself will generate high heat. When the temperature is too high (not more than 50°C), whether the fiber optic transceiver works normally is a factor worthy of consideration by customers!

Fiber optic transceivers are very common in weak current engineering, with low price, stable performance and simple use. There are many types of fiber optic transceivers in the market today.

When purchasing fiber optic transceivers, try to choose a well-known and branded fiber optic transceiver manufacturer. Don't be petty. Some fiber optic transceivers of poor quality often fail and will bring you a lot of trouble.

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